[deps] Billing: Update Braintree to 5.39.0

Author: renovate[bot]

src/Core/Core.csproj

@@ -57,7 +57,7 @@
     <PackageReference Include="Duende.IdentityServer" Version="7.2.4" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="AspNetCoreRateLimit" Version="5.0.0" />
-    <PackageReference Include="Braintree" Version="5.36.0" />
+    <PackageReference Include="Braintree" Version="5.39.0" />
     <PackageReference Include="Stripe.net" Version="48.5.0" />
     <PackageReference Include="Otp.NET" Version="1.4.0" />
     <PackageReference Include="YubicoDotNetClient" Version="1.2.0" />